Joseph smith



UNITED STATES PATENT OFFICE.

JOSEPH SMITH, OF CINCINNATI, OHIO, ASSIGNOR TO HIMSELF AND ROBERT R.LYND, OF SAME PLACE.

SHEARS.

Specification of Letters Patent No. 26,955, dated January 24, 1860.

To all whom it may concern:

Be it known that I, JOSEPH SMITH, of Cincinnati, Hamilton county, Ohio,have invented a certain new and useful Improvement in Tinners and otherShears; and I hereby declare the following to be a full, clear, andexact description of the same, reference being had to the accompanyingdrawings, making part of this specification.

The invention relates to the class of shears which act with a nearlyequal draw cut throughout the entire length of the blades.

In the accompanying drawings Figure l is a side elevation of my shearsin their eX- tended condition. Fig. 2 is a side elevation, the bladesbeing partially closed and a portion of the casing being removed.

The lower blade A, consists of a back a, shank a', handle or bow a, alug or rojection a", which extends forward from the rear portion orshank a, and a steel bit H whose back is secured in a recessed ordovetailed notch I in the blade back, its front or ground edge beingheld by the stud J so that however much or often the bit is ground thelength and breadth of the blade will remain unchanged and its cuttingedge will preserve its original position in the shears.

The lug a" and casing plate C confine laterally between them the upperblade D. The lug a" and plate C have corresponding oblique slots ewhichreceive guides E projecting from the upper blade D. The guidesl Econsist of a single pin, flattened so as to afford an extended bearingsurface where it engages in the slots e, and rounded in its intermediateportion so as to be capable of turning in the blade D. The handle d ofthe blade D is pivoted (Gr) to the shank a at a point considerably abovethe line of the cutting edge of the lower blade and is connected to theblade D by a wrist F nearly in line with the cutting edge of said blade.

K, is a set screw in the plate C of regulate the bite of the shears byadjusting their lateral pressure against each other. The cutting portionof the blades bein detachable may be ground separately Irom the shearsand replaced or substituted by others with very little trouble.

It will be seen that when the shears are extended, the, two blades willstand well apart at the throat so as to admit a great thickness ofgoods. The action is first to close quickly the heel or inner end of theblade D down upon the work after which the blade D acts upon the blade Awith a nearly uniform draw cut from the heel to the point. The action ofthe wrist results however in a slightly increasing draw upon the upperblade D as it closes upon the lower blade, thus rendering the actionmore powerful as it approaches the part of the blades which is leastsupported and most distant from the hand of the o rator. Shears on thisprinciple of construction may be advantageously employed in cuttinggreat thicknesses of cloth and are also applicable for use on otherrefractory substances such as pasteboard sheet metal leather &c.

The following is what I claim as new and of my invention herein anddesire to secure by Letters Patent:

l. The oblique guide slot-s e, guide pin E and wrist F, constructedcombined and operating in connection with the blade D and handle 0l,substantially as and for the purposes set forth.

2. The construction and combination of the dovetailed back a, stub J andmovable bit H of the blade adapted in the manner set forth to preservethe original length and breadth of the blade and the position of itscutting edge.

In testimony of which invention, I hereunto set my hand.

` JOSEPH SMITH. Titnesses GEO. H. KNIGHT, C. STEEMER, Jr.

